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This is my old NIKON F3 Looks like a halfmoon and makes it possible to make doubleexposures whithout TRIX. The lock, camera on / off The trigger Opens and locks the mirror when using fisheye, or for noiseless shooting. Timerlight, to se when the camera shoots you. This button makes it possible to remove tho top. To switch the glass or only for cleaning. Is also very handy when shooting frogs and ants. When the batteries are dead you can still work. The lens, in this case  24mm / 2.00 The manual winder, when not the motordrive MD4 is in use. Shutterspeedselector

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